65671638 has 32 divisors (see below), whose sum is σ = 138672000. Its totient is φ = 20676096.

The previous prime is 65671637. The next prime is 65671681. The reversal of 65671638 is 83617656.

It is a self number, because there is not a number n which added to its sum of digits gives 65671638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65671637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50545 + ... + 51827.

It is an arithmetic number, because the mean of its divisors is an integer number (4333500).

Almost surely, 2^65671638 is an apocalyptic number.

65671638 is an abundant number, since it is smaller than the sum of its proper divisors (73000362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65671638 is a wasteful number, since it uses less digits than its factorization.

65671638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1756.

The product of its digits is 181440, while the sum is 42.

The square root of 65671638 is about 8103.8039216161. The cubic root of 65671638 is about 403.4526907339.

The spelling of 65671638 in words is "sixty-five million, six hundred seventy-one thousand, six hundred thirty-eight".